Correlation effects and structural dynamics in the β-pyrochlore superconductor KOs2O6
J. Kuneš, T. Jeong, W. E. Pickett
DOI 10.1103/PhysRevB.70.174510 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Electronic, magnetic, and dynamical properties of superconducting β-pyrochlore KOs2O6 and related RbOs2O6 and CsOs2O6 compounds are calculated and compared with experiment and contrasted with structurally related spinel pyrochlores. The calculated susceptibility Stoner enhancement (110%) and thermal mass enhancement λ=2.5–3 reflect moderate but perhaps important Coulomb correlations. The K+ ion optic mode is found to be unstable, allowing large excursions of 0.5–0.6Å from its ideal site of the K ion along ⟨111⟩ directions. This dynamical mode is much less anharmonic in the isostructural Rb and Cs compounds (with larger cations), perhaps accounting for their progressively lower values of Tc. Electron scattering from this very anharmonic mode may be the cause of the anomalous concave-downward resistivity that is seen only in KOs2O6.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.6 | Pressure not reported | unknown |
| RbOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.3 | Pressure not reported | unknown |
| CsOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.2 | Pressure not reported | unknown |
| LiTi2O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | Pressure not reported | unknown |
| Cd2Re2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | unknown |
Similar papers
Crystal growth, structure, and superconducting properties of the β-pyrochlore KOs2O6
similarity 0.98G. Schuck et al.
Source status unknown — claims are unverified
Interplay of Superconductivity and Rattling Phenomena in β-Pyrochlore KOs2O6 Studied by Photoemission Spectroscopy
similarity 0.97T. Shimojima et al.
Source status unknown — claims are unverified
Superconducting to spin-glass state transformation in β-pyrochlore KxOs2O6
similarity 0.97C. C. Lee et al.
Source status unknown — claims are unverified
Scanning Tunneling Spectroscopy in the Superconducting State and Vortex Cores of the β-Pyrochlore KOs2O6
similarity 0.97C. Dubois et al.
Source status unknown — claims are unverified
Mass enhancement, correlations, and strong-coupling superconductivity in the β-pyrochlore KOs2O6
similarity 0.97M. Brühwiler et al.
Source status unknown — claims are unverified
Evidence for Charged Critical Behavior in the Pyrochlore Superconductor RbOs2O6
similarity 0.96T. Schneider et al.
Source status unknown — claims are unverified